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Page 1
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
DESCRIPTION
RangeMAX Wide Range Dimming,
Single Output Inverter. The
LXMG1612-12-xx series of Direct
Drive™ CCFL (Cold Cathode
Fluorescent Lamp) Inverter Modules are
specifically de-signed for driving LCD
backlight lamps.
RangeMAX Digital Dimming
Technique. Digital Dimming provides
flicker-free brightness control in any
wide-range dimming application.
The modules are equipped with a
dimming input that permits brightness
control from an external potentiometer,
DC voltage source, or PWM signal. The
resultant “burst drive” that energizes the
lamp was designed specifically to ensure
that no premature lamp degradation
occurs.
Input Voltage Range: The modules
convert DC voltage from the system
battery or AC adapter directly to high-
frequency, high-voltage waves required
to ignite and operate CCFL lamps. A 5V
input inverter is also available
(LXMG1612-05-xx).
Direct Drive Technology: The module
design is based on a new Direct Drive
topology, which provides a number of
cost and performance advantages.
Additional Features: Other benefits of
this new topology are fixed-frequency
operation and secondary-side strike-
voltage regulation and all LXMG1612-
12-xx modules feature both open and
shorted lamp protection.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,923,129; 5,930,121; Patents Pending
KEY FEATURES
RangeMAX Wide Range
Dimming
9.6V to 14.4V Input Voltage
Fully Integrated Direct Drive
And Dimming Control
Single Sided PCB Layout
Easy To Use Brightness
Control
MicroAmp
SLEE
P
Mode
Output Short-Circuit Prot ection
And Automatic Strike-Voltage
Regulation
Fixed Frequency Operation
UL 60950 Pending
RoHS Compliant
APPLICATIONS
Notebook And Sub-Noteb ook
Computers
Portable Instrumentation
Desktop Displays
Low Ambient Light Conditions
(i.e. Aircraft Cabins,
Automobile)
BENEFITS
Smooth, Flicker Free 1-100%
Full-Range Brightness Control
Gives Your Product A High
Quality Image
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For Long Life And
High Reliability
Power Efficient. “Low
Brightness” Capability Allows
For Advanced Power
Management
PRODUCT HIGHLIGHT
123
W
DC Voltage
Source Potentiometer PWM
Signal
UNIVERSAL D IMMING INPUT
"PWM", VDC,OR POTENTIOMETER
BRITE
Microsemi
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1612-12-01 JST SM02(8.0)B-BHS-1-TB (LF)(SN) or Yeon Ho 20015WR-05A00 BHR-03VS-1
LXMG1612-12-02 JST SM02B-BHSS-1-TB (LF)(SN)or Yeon Ho 35001WR-02A00 BHSR-02VS-1
LXMG1612-12-03 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01
L
LX
XM
MG
G1
16
61
12
2-
-1
12
2
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Page 2
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1).................................................................................................................................-0.3V to 16V
Output Voltage, no load.........................................................................................................Internally Limi ted to 1800VRMS
Output Current ........................................................................................................................8.0mARMS (Internally Limited)
Output Power .................................................................................................................................................................. 6.0W
Input Signal Voltage (BRITE Input)..................................................................................................................-0.3V to 5.5V
Input Signal Voltage (SLEEP, VSYNC Inputs).....................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................0°C to 70°C
Storage Temperature Range.............................................................................................................................. -40°C to 85°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of
specified terminal.
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN1 (Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins
CN-1
CN1-2 VIN1 Main Input Power Supply (9.6V < VIN1 < 14.4V)
CN1-3
CN1-4 GND Power Supply Return
CN1-5 SLEEP ON/OFF Control. (2.1V < SLEEP < VIN1 = ON, 0V < SLEEP < 0. 8V = OFF,SLEEP Floating=OFF)
CN1-6 BRITE Brightness Control (0.0V to 2.5VDC). 2.5VDC gives maximum lamp current.
CN1-7 BRITE RTN Analog Ground. Use f or BRITE signal return ONLY.
CN1-8 VSYNC Vertical Synchronization Input. 2.5 to 5.0V Logic Level. (20Hz < fSYNC < 200Hz)
CN2 for LXMG1612-12-01 and -02 (JST SM02(8.0)B-BHS-1-TB (LF)(SN) | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB
(LF)(SN) | Yeon Ho 35001WR-02A00)
CN2-1 VHI High voltage conn ection to high side of lamp. Connect to lamp terminal with short est lead length.
DO NOT connect to Ground.
CN2-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
CN2 for LXMG1612-12-03 (Honda QZ-19-A3MYL#02)
CN2-3 VHI High voltage conn ection to high side of lamp. Connect to lamp terminal with short est lead length.
DO NOT connect to Ground.
CN2-1 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
PHYSICAL DIMENSIONS
LXMG1612-12-XX
4.96in.
126mm
0.06in.
1.52mm
CN1
CN2
W
X
0.13in.
3.3mm
0.66in.
16.75mm
Weight: 12.5 (g) typ.
0.63in.
16mm
3.64in.
92.5mm
0.5in.
12.7mm
0.315in.
8.0mm
Warning
High Voltage Present at all
Output Connectors
GROUNDED MOUNTING HOLE
3.0mmDIA. ± .08DIA
MOUNTING HOLE
3.0mmDIA. ± .08DIA
PCB tole r anc es ± 0.5mm
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D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
RECOMMENDED OPERATING CONDITIONS (R.C.)
This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance
will be obtained if the module is operated under the condition listed in the ‘R.C.’ column. Min. and Max. columns indicate values beyond
which the inverter, although operational, will not function optimally.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max Units
Input Supply V oltage Range (Full y Regulated
Lamp Current) 10.8 12 13.2
Input Supply Voltage Range (Functional) VIN1 9.6 12 14.4 V
Output Power PO 3.5 4.0 W
Brightness Control Input Voltage Range VBRT_ADJ 0.0 2.5 5 V
Lamp Operating Voltage VLAMP 450 535 620 VRMS
Lamp Current (Full Brig htness) IOLAMP 5.8 mARMS
Operating Ambient Temperature Range TA 0 70 °C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating conditions and ambient temperature of
25°C except where otherwise noted.
LXMG1612-12-xx
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current IL(MAX) VBRT_ADJ=2.5VDC, SLEEP=HIGH,
Burst Duty=100%, VIN1=12VDC 5.2 5.8 6.4 mARMS
Min. Average Lamp Current
(Note 2) IL(MIN) VBRT_ADJ=0VDC, SLEEP=HIGH, Burst Duty=2.0%,
VIN1=12VDC 0.12 mARMS
Lamp Start Voltage VLS 0°C <TA < 70°C, VIN1 > 9.6VDC 1500 1650 1800 VRMS
Operating Frequency fO VBRT_ADJ=2.5VDC, SLEEP=HIGH, VIN1=9.6V – 14.4V 63 68 73 kHz
` BRITE INPUT
V
BRT_ADJ=0VDC -685 -728 -775 µADC
Input Current IBRT VBRT_ADJ=2.5VDC -260 -282 -305 µADC
Input Voltage for Max. Lamp Current VBRT_ADJ I
O(LAMP)=100% Duty Cycle 2.30 2.35 2.40 VDC
Input Voltage for Min. Lamp Current VBRT_ADJ I
O(LAMP)= Minimum Duty Cycle 0.0 VDC
` SLEEP INPUT
RUN Mode V(HI)SLEEP VIN1=12V 1.9 2.1 VIN1 V
DC
SLEEP Mode V(LO)SLEEP VIN1=12V -5.0 1.9 2.0 VDC
SLEEP=5.0V 390 410 435 µADC
Input Current ISLEEP SLEEP=0V 0.0 0.0 0.0 µADC
` VSYNC CHARACTERISTICS
V
SYNCH(HI) V
IN1=12V 1.50 2.5 5.0 VDC
Logic High Level VSYNCH(LO) V
IN1=12V -3.0 0.0 1.2 VDC
Input Impedance ZIN 25 27 29 KΩ
Input Frequency fSYNC 20 200 Hz
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) VIN1=12VDC, SLEEP=0.0V 0.0 0.5 10 µADC
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
Average RMS current = (burst duty cycle) x (burst amplitude of 5.8mARMS)
E
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D
ATASHEET
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Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
HOW RANGEMAX WORKS
LAMP VOLTAGE & LAMP CURRENT – Burst Mode Operation
Figure 1 – 50% Burst Duty Cycle Figure 2 – 2% Burst Duty Cycle
Rather than using the traditional dimming technique of varying
lamp current magnitude to adjust light output, RangeMAX
inverters use a fixed lamp current value with a duty cycle control
method.
The lamp current burst width can be modulated from 100%
(continuous lamp current) down to a 2% duty cycle, allowing the
lamp to be di mm ed to less than 1% of its full brightness.
As can be seen in Trace 4 of Figure 3 photo at right, careful
design consideration was given to controlling lamp start voltage
to softly start current flow. This eliminates current overshoot that
can result in premature cathode wear and reduce lamp life.
Figure 3 – 2% Burst Duty Cycle (Expanded Time Base)
Ramp Gen
Transformer
Driver
0.25 -
2.5VDC
+
-
LAMP
VLO
VHI
Comparator
Ramp
VBRITE
VSYNC
High Voltage
Transformer
ISENSE
VSENSE
Figure 4 – RangeMAX Block Diagr am
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Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
HOW RANGEMAX WORKS (CONTINUED)
Highlights
Integrated brightness control circuit includes a DC voltage to
pulse width converter that minimizes system design work and
system noise susceptibility. This provides a familiar and
convenient interface while reducing the potential for
externally induced noise, which can cause lamp flicker.
RangeMAX inverter modules are designed to operate with the
burst frequency synchronized to the video frame rate. This
provides operation with no visible display disturbances
caused by beat frequencies between the lamps and video
frame rates. In this synchronous mode, the inverter burst rate
operates at twice the video refresh rate, well beyond standard
50/60Hz video refresh rates where the eye can perceive
pulsing light.
In applications with no access to a vertical sync., an onboard
oscillator operates the inverter burst rate at about 250Hz. In
this non-synchronous mode, minor display disturbances can
be found under certain video conditions. This performance
may be acceptable for many applications, but
synchronization must be used when no disturbance can be
tolerated.
A single input will accommodate negative and positive
vertical sync pulses at any pulse width.
Separate feedback loops for lamp current and open circuit
voltage regulation insure reliable strike under all operating
conditions, automatic over-voltage prevention with broken
or failed lamps, and accurate lamp current regulation.
TYPICAL APPLICATION
LXMG1612-12-xx
12V
VSYNC
VSYNC GND
VHI
VLO
BRITE
Figure 5 - Potentiometer Brightness Control
VIN1
CCFL
TUBE
BRITE RTN
R
10k
SLEEP
0V 5V
DAC or
Pot
P.W.
< 2ms
BRITE
LXMG1612-12-xx
0 < P.W. < 100% of period
PWM Signal
from System
Figure 5A - PWM Brightness Control
The brightness control may be a voltage output DAC, digital
resistor or a simple 10k potentiometer. If desired, an
additional series resistor with the 10k potentiometer can be
used to set a higher minimum brightness setting as shown in
Figure 5. A 2.5V to 5V Logic Level PWM signal from a
micro-controller ma y also be used as shown in Figure 5A.
If synchronization to the video frame rate is desired, connect
the vertical sync pulse from the system video controller to
the VSYNC input. If no video synchronization is desired,
connect VSYNC to ground.
If you need to turn the inverter ON/OFF remotely, connect
to 2.5V to 5V logic signal to the SLEEP input.
Connect VHI to high voltage wire from the lamp. Connect
VLO to the low voltage wire (wire with thinner insulation).
Never connect VLO to circuit ground as this will defeat lamp
current regulation. If both lamp wires have heavy high
voltage insulation, connect the longest wire to VLO. This
wire is typically white.
LXMG1612-12-XX OUTPUT CURRENT ADJUST
The LXMG1612-12 output current can be adjusted by changing the
value of two resistors on the PCB. The following table shows the
approximate new output current values:
Output Current R12 R16
7.0mA 2.00K 1% Not Used
6.0mA 2.61K 1% Not Used
5.8mA 2.74K 1% Not Used
5.0mA 2.74K 1% 499K 1%
4.0mA 2.74K 1% 178K 1%
3.0mA 2.74K 1% 78.7K 1%
C2
U1
C9 R7
C11 R14
R15
C15
C12
R11
C14
C13
R10
C16
C10
R13
C17
R3R4
C3
C4
R2
C5
C6 C8
R5
R6
R17
R37
R36
R35
C21
R38
R39
R32
R31
R40
R41
R20
C7
R21
U3
R34R33R30
U4
D2 D1
R16
R12
Figure 6- Component Replacement Locations
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ATASHEET
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Page 6
Copyright © 2000
Rev. 1.0, 2006-03-01
WWW.Microsemi .COM
LXMG1612-12-xx
12V Highly-Integrated, Digital Dimming CCFL Inverter Module
TM ®
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include test ing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
N
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